Release 2.0.0-M13
This should be the last milestone release and contains some important changes:
- Use sbt-tzdb to build the timezone db
- Publish only the java.time package
- Updated to scala.js 0.6.22
- Updated tzdb to 2018c
- Split packages for test and tzdb
- Updated to scala 2.12.4
- Updated to scala 2.11.12
- Support scala.js 1.0.0-M3